Bhagavatapurana 3.27.14

3.27.14

bhūta-sūkṣmendriya-mano- buddhy-ādiṣv iha nidrayā /
līneṣv asati yas tatra vinidro nirahaṅkriyaḥ //

14. In the state of sleep when the subtle principles of the Bhutas, the Indriyas, Manas, Buddhi, etc. are withdrawn into the Asat (the unmanifest Principle), He who remains uanffected by sleep and Ahankara, realises the Atman.